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# uppertail probability functions HP PRIME and HP 50g

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HP PRIME
Microsoft Windows 10 (64-bit)

Goodmorning everyone. I would like to ask if, in the HP PRIME calculator, the degrees of freedom of the "FISHER_CDF (n1, n2, F)" function must necessarily be integers. In fact, non-integer degrees of freedom are also accepted in the HP 50g.

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Hi!, @RobMio :

You can only use the command F = FISHER_CDF, without CAS as ...

Kind Regards !.
Have a nice day !.
Provost in HP Spanish Public Forum ... https://h30467.www3.hp.com/
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Non integer values work fine.

TW

Although I work for the HP calculator group as a head developer of the HP Prime, the views and opinions I post here are my own.
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But, for example, if I insert:  FISHER_CDF (1.5,5.8, 29.3), the calculator returns: "Error: Ivalid input". On the other hand, if, using the definite integral of the Fisher-Snedecor distribution, I insert:

the calculator gives me the right value, and returns it instantly: 0.456776180925. What do you mean by writing: "Non integer values work fine"?

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I apologize, the result of the integral is:

0.998803207622.

I checked the result with MATHEMATICA 12.0

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Excuse me, the result of the integral is (I checked the result with MATHEMATICA 12.0):

0.998803207622

Best regards, Roberto Mioni

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